Based on the field tests, the following conclusions as for the solidification of GBF-slag were obtained. (1) The operating time of SCP method for the GBF-slag is almost the same as for the natural marine sand and no effect of GBF-slag on the quality of surrounding water was observed. (2) The internal friction angle of GBF-slag is over 35° which is higher than natural marine sand. The GBF-slag piles become more stable by solidification. (3) The submerged unit weight γ_(sub) of GBF-slag is about 8kN/m~3. (4) The grain of GBF-slag is crushed by the compaction in the SCP method. After the installation of piles, the medium grain size D_(50) is about 60% finer than the original one. (5) Remarkable solidification of GBF-slag pile was observed. This is due to grain crushing induced by the pile installation. (6) When curing the GBF-slag in the sea water, the shear strength such as cohesion C and unconfined compression strength increased remarkably and the coefficient of permeability decreased due to the solidification of GBF-slag.
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